Silicone question

ms_minnamouseMarch 28, 2011

I have a question about silicone, like the kind you use for kitchen and bath, windows and doors, etc.

Will wet silicone bond with dry silicone? What I mean is, if you do put some silicone down and it dries and then you add more onto it later, will it bond and create a water tight seal?

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In my experience, it will not bond very well, although it may seem to if you lay down a big bead of it that covers the old stuff. Generally, it's usually better to cut away old caulk -- of any kind -- with a razor blade before re-caulking.

What are you trying to do?

    Bookmark   March 28, 2011 at 1:58PM
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Adding almost any kind of caulk/sealer/etc. over another, even the same type/kind/brand, is not a good practice.

Silicon glazes when cured, creating a smooth imprevious finish that resists moisture/dirt/etc.

So, if there is a problem with an existing area, remove all the old sealer, clean with alcohol, make sure all moisture and foreign materials are gone, and reapply new material.

    Bookmark   March 28, 2011 at 3:12PM
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Ok, I called Dow Corning and they said that it will adhere and create a water tight seal. I'll rough up the silicone where I add to it just in case and hope for the best.

I'm sealing an aquarium.

    Bookmark   March 28, 2011 at 6:45PM
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Well, good luck. If it starts leaking in a while, follow the advice about removing the old stuff.

    Bookmark   March 29, 2011 at 1:10PM
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